« back to all changes in this revision
Viewing changes to decode.c
- browse files at revision 1
- compare with another revision
- download diff
- download tarball
- view history from revision 1
- Committer: Bazaar Package Importer
- Author(s): Thomas Schoepf
- Date: 2002-04-04 16:43:52 UTC
- Revision ID: james.westby@ubuntu.com-20020404164352-qldq048yoc7x5sd5
Tags: upstream-374
Import upstream version 374
- files added:
added
removed
decode.c
1
/*
2
* Copyright (C) 1984-2000 Mark Nudelman
3
*
4
* You may distribute under the terms of either the GNU General Public
5
* License or the Less License, as specified in the README file.
6
*
7
* For more information about less, or for information on how to
8
* contact the author, see the README file.
9
*/
10
11
12
/*
13
* Routines to decode user commands.
14
*
15
* This is all table driven.
16
* A command table is a sequence of command descriptors.
17
* Each command descriptor is a sequence of bytes with the following format:
18
* <c1><c2>...<cN><0><action>
19
* The characters c1,c2,...,cN are the command string; that is,
20
* the characters which the user must type.
21
* It is terminated by a null <0> byte.
22
* The byte after the null byte is the action code associated
23
* with the command string.
24
* If an action byte is OR-ed with A_EXTRA, this indicates
25
* that the option byte is followed by an extra string.
26
*
27
* There may be many command tables.
28
* The first (default) table is built-in.
29
* Other tables are read in from "lesskey" files.
30
* All the tables are linked together and are searched in order.
31
*/
32
33
#include "less.h"
34
#include "cmd.h"
35
#include "lesskey.h"
36
37
extern int erase_char, kill_char;
38
extern int secure;
39
40
#define SK(k) \
41
SK_SPECIAL_KEY, (k), 6, 1, 1, 1
42
/*
43
* Command table is ordered roughly according to expected
44
* frequency of use, so the common commands are near the beginning.
45
*/
46
47
static unsigned char cmdtable[] =
48
{
49
'\r',0, A_F_LINE,
50
'\n',0, A_F_LINE,
51
'e',0, A_F_LINE,
52
'j',0, A_F_LINE,
53
SK(SK_DOWN_ARROW),0, A_F_LINE,
54
CONTROL('E'),0, A_F_LINE,
55
CONTROL('N'),0, A_F_LINE,
56
'k',0, A_B_LINE,
57
'y',0, A_B_LINE,
58
CONTROL('Y'),0, A_B_LINE,
59
SK(SK_CONTROL_K),0, A_B_LINE,
60
CONTROL('P'),0, A_B_LINE,
61
SK(SK_UP_ARROW),0, A_B_LINE,
62
'J',0, A_FF_LINE,
63
'K',0, A_BF_LINE,
64
'Y',0, A_BF_LINE,
65
'd',0, A_F_SCROLL,
66
CONTROL('D'),0, A_F_SCROLL,
67
'u',0, A_B_SCROLL,
68
CONTROL('U'),0, A_B_SCROLL,
69
' ',0, A_F_SCREEN,
70
'f',0, A_F_SCREEN,
71
CONTROL('F'),0, A_F_SCREEN,
72
CONTROL('V'),0, A_F_SCREEN,
73
SK(SK_PAGE_DOWN),0, A_F_SCREEN,
74
'b',0, A_B_SCREEN,
75
CONTROL('B'),0, A_B_SCREEN,
76
ESC,'v',0, A_B_SCREEN,
77
SK(SK_PAGE_UP),0, A_B_SCREEN,
78
'z',0, A_F_WINDOW,
79
'w',0, A_B_WINDOW,
80
ESC,' ',0, A_FF_SCREEN,
81
'F',0, A_F_FOREVER,
82
'R',0, A_FREPAINT,
83
'r',0, A_REPAINT,
84
CONTROL('R'),0, A_REPAINT,
85
CONTROL('L'),0, A_REPAINT,
86
ESC,'u',0, A_UNDO_SEARCH,
87
'g',0, A_GOLINE,
88
SK(SK_HOME),0, A_GOLINE,
89
'<',0, A_GOLINE,
90
ESC,'<',0, A_GOLINE,
91
'p',0, A_PERCENT,
92
'%',0, A_PERCENT,
93
ESC,'[',0, A_LSHIFT,
94
ESC,']',0, A_RSHIFT,
95
ESC,'(',0, A_LSHIFT,
96
ESC,')',0, A_RSHIFT,
97
SK(SK_RIGHT_ARROW),0, A_RSHIFT,
98
SK(SK_LEFT_ARROW),0, A_LSHIFT,
99
'{',0, A_F_BRACKET|A_EXTRA, '{','}',0,
100
'}',0, A_B_BRACKET|A_EXTRA, '{','}',0,
101
'(',0, A_F_BRACKET|A_EXTRA, '(',')',0,
102
')',0, A_B_BRACKET|A_EXTRA, '(',')',0,
103
'[',0, A_F_BRACKET|A_EXTRA, '[',']',0,
104
']',0, A_B_BRACKET|A_EXTRA, '[',']',0,
105
ESC,CONTROL('F'),0, A_F_BRACKET,
106
ESC,CONTROL('B'),0, A_B_BRACKET,
107
'G',0, A_GOEND,
108
ESC,'>',0, A_GOEND,
109
'>',0, A_GOEND,
110
SK(SK_END),0, A_GOEND,
111
'P',0, A_GOPOS,
112
113
'0',0, A_DIGIT,
114
'1',0, A_DIGIT,
115
'2',0, A_DIGIT,
116
'3',0, A_DIGIT,
117
'4',0, A_DIGIT,
118
'5',0, A_DIGIT,
119
'6',0, A_DIGIT,
120
'7',0, A_DIGIT,
121
'8',0, A_DIGIT,
122
'9',0, A_DIGIT,
123
124
'=',0, A_STAT,
125
CONTROL('G'),0, A_STAT,
126
':','f',0, A_STAT,
127
'/',0, A_F_SEARCH,
128
'?',0, A_B_SEARCH,
129
ESC,'/',0, A_F_SEARCH|A_EXTRA, '*',0,
130
ESC,'?',0, A_B_SEARCH|A_EXTRA, '*',0,
131
'n',0, A_AGAIN_SEARCH,
132
ESC,'n',0, A_T_AGAIN_SEARCH,
133
'N',0, A_REVERSE_SEARCH,
134
ESC,'N',0, A_T_REVERSE_SEARCH,
135
'm',0, A_SETMARK,
136
'\'',0, A_GOMARK,
137
CONTROL('X'),CONTROL('X'),0, A_GOMARK,
138
'E',0, A_EXAMINE,
139
':','e',0, A_EXAMINE,
140
CONTROL('X'),CONTROL('V'),0, A_EXAMINE,
141
':','n',0, A_NEXT_FILE,
142
':','p',0, A_PREV_FILE,
143
't',0, A_NEXT_TAG,
144
'T',0, A_PREV_TAG,
145
':','x',0, A_INDEX_FILE,
146
':','d',0, A_REMOVE_FILE,
147
'-',0, A_OPT_TOGGLE,
148
':','t',0, A_OPT_TOGGLE|A_EXTRA, 't',0,
149
's',0, A_OPT_TOGGLE|A_EXTRA, 'o',0,
150
'_',0, A_DISP_OPTION,
151
'|',0, A_PIPE,
152
'v',0, A_VISUAL,
153
'!',0, A_SHELL,
154
'+',0, A_FIRSTCMD,
155
156
'H',0, A_HELP,
157
'h',0, A_HELP,
158
SK(SK_F1),0, A_HELP,
159
'V',0, A_VERSION,
160
'q',0, A_QUIT,
161
'Q',0, A_QUIT,
162
':','q',0, A_QUIT,
163
':','Q',0, A_QUIT,
164
'Z','Z',0, A_QUIT
165
};
166
167
static unsigned char edittable[] =
168
{
169
'\t',0, EC_F_COMPLETE, /* TAB */
170
'\17',0, EC_B_COMPLETE, /* BACKTAB */
171
SK(SK_BACKTAB),0, EC_B_COMPLETE, /* BACKTAB */
172
ESC,'\t',0, EC_B_COMPLETE, /* ESC TAB */
173
CONTROL('L'),0, EC_EXPAND, /* CTRL-L */
174
CONTROL('V'),0, EC_LITERAL, /* BACKSLASH */
175
CONTROL('A'),0, EC_LITERAL, /* BACKSLASH */
176
ESC,'l',0, EC_RIGHT, /* ESC l */
177
SK(SK_RIGHT_ARROW),0, EC_RIGHT, /* RIGHTARROW */
178
ESC,'h',0, EC_LEFT, /* ESC h */
179
SK(SK_LEFT_ARROW),0, EC_LEFT, /* LEFTARROW */
180
ESC,'b',0, EC_W_LEFT, /* ESC b */
181
ESC,SK(SK_LEFT_ARROW),0, EC_W_LEFT, /* ESC LEFTARROW */
182
SK(SK_CTL_LEFT_ARROW),0, EC_W_LEFT, /* CTRL-LEFTARROW */
183
ESC,'w',0, EC_W_RIGHT, /* ESC w */
184
ESC,SK(SK_RIGHT_ARROW),0, EC_W_RIGHT, /* ESC RIGHTARROW */
185
SK(SK_CTL_RIGHT_ARROW),0, EC_W_RIGHT, /* CTRL-RIGHTARROW */
186
ESC,'i',0, EC_INSERT, /* ESC i */
187
SK(SK_INSERT),0, EC_INSERT, /* INSERT */
188
ESC,'x',0, EC_DELETE, /* ESC x */
189
SK(SK_DELETE),0, EC_DELETE, /* DELETE */
190
ESC,'X',0, EC_W_DELETE, /* ESC X */
191
ESC,SK(SK_DELETE),0, EC_W_DELETE, /* ESC DELETE */
192
SK(SK_CTL_DELETE),0, EC_W_DELETE, /* CTRL-DELETE */
193
SK(SK_CTL_BACKSPACE),0, EC_W_BACKSPACE, /* CTRL-BACKSPACE */
194
ESC,'\b',0, EC_W_BACKSPACE, /* ESC BACKSPACE */
195
ESC,'0',0, EC_HOME, /* ESC 0 */
196
SK(SK_HOME),0, EC_HOME, /* HOME */
197
ESC,'$',0, EC_END, /* ESC $ */
198
SK(SK_END),0, EC_END, /* END */
199
ESC,'k',0, EC_UP, /* ESC k */
200
SK(SK_UP_ARROW),0, EC_UP, /* UPARROW */
201
ESC,'j',0, EC_DOWN, /* ESC j */
202
SK(SK_DOWN_ARROW),0, EC_DOWN, /* DOWNARROW */
203
};
204
205
/*
206
* Structure to support a list of command tables.
207
*/
208
struct tablelist
209
{
210
struct tablelist *t_next;
211
char *t_start;
212
char *t_end;
213
};
214
215
/*
216
* List of command tables and list of line-edit tables.
217
*/
218
static struct tablelist *list_fcmd_tables = NULL;
219
static struct tablelist *list_ecmd_tables = NULL;
220
static struct tablelist *list_var_tables = NULL;
221
static struct tablelist *list_sysvar_tables = NULL;
222
223
224
/*
225
* Expand special key abbreviations in a command table.
226
*/
227
static void
228
expand_special_keys(table, len)
229
char *table;
230
int len;
231
{
232
register char *fm;
233
register char *to;
234
register int a;
235
char *repl;
236
int klen;
237
238
for (fm = table; fm < table + len; )
239
{
240
/*
241
* Rewrite each command in the table with any
242
* special key abbreviations expanded.
243
*/
244
for (to = fm; *fm != '\0'; )
245
{
246
if (*fm != SK_SPECIAL_KEY)
247
{
248
*to++ = *fm++;
249
continue;
250
}
251
/*
252
* After SK_SPECIAL_KEY, next byte is the type
253
* of special key (one of the SK_* contants),
254
* and the byte after that is the number of bytes,
255
* N, reserved by the abbreviation (including the
256
* SK_SPECIAL_KEY and key type bytes).
257
* Replace all N bytes with the actual bytes
258
* output by the special key on this terminal.
259
*/
260
repl = special_key_str(fm[1]);
261
klen = fm[2] & 0377;
262
fm += klen;
263
if (repl == NULL || (int) strlen(repl) > klen)
264
repl = "\377";
265
while (*repl != '\0')
266
*to++ = *repl++;
267
}
268
*to++ = '\0';
269
/*
270
* Fill any unused bytes between end of command and
271
* the action byte with A_SKIP.
272
*/
273
while (to <= fm)
274
*to++ = A_SKIP;
275
fm++;
276
a = *fm++ & 0377;
277
if (a & A_EXTRA)
278
{
279
while (*fm++ != '\0')
280
continue;
281
}
282
}
283
}
284
285
/*
286
* Initialize the command lists.
287
*/
288
public void
289
init_cmds()
290
{
291
/*
292
* Add the default command tables.
293
*/
294
add_fcmd_table((char*)cmdtable, sizeof(cmdtable));
295
add_ecmd_table((char*)edittable, sizeof(edittable));
296
#if USERFILE
297
/*
298
* For backwards compatibility,
299
* try to add tables in the OLD system lesskey file.
300
*/
301
#ifdef BINDIR
302
add_hometable(NULL, BINDIR "/.sysless", 1);
303
#endif
304
/*
305
* Try to add the tables in the system lesskey file.
306
*/
307
add_hometable("LESSKEY_SYSTEM", LESSKEYFILE_SYS, 1);
308
/*
309
* Try to add the tables in the standard lesskey file "$HOME/.less".
310
*/
311
add_hometable("LESSKEY", LESSKEYFILE, 0);
312
#endif
313
}
314
315
/*
316
* Add a command table.
317
*/
318
static int
319
add_cmd_table(tlist, buf, len)
320
struct tablelist **tlist;
321
char *buf;
322
int len;
323
{
324
register struct tablelist *t;
325
326
if (len == 0)
327
return (0);
328
/*
329
* Allocate a tablelist structure, initialize it,
330
* and link it into the list of tables.
331
*/
332
if ((t = (struct tablelist *)
333
calloc(1, sizeof(struct tablelist))) == NULL)
334
{
335
return (-1);
336
}
337
expand_special_keys(buf, len);
338
t->t_start = buf;
339
t->t_end = buf + len;
340
t->t_next = *tlist;
341
*tlist = t;
342
return (0);
343
}
344
345
/*
346
* Add a command table.
347
*/
348
public void
349
add_fcmd_table(buf, len)
350
char *buf;
351
int len;
352
{
353
if (add_cmd_table(&list_fcmd_tables, buf, len) < 0)
354
error("Warning: some commands disabled", NULL_PARG);
355
}
356
357
/*
358
* Add an editing command table.
359
*/
360
public void
361
add_ecmd_table(buf, len)
362
char *buf;
363
int len;
364
{
365
if (add_cmd_table(&list_ecmd_tables, buf, len) < 0)
366
error("Warning: some edit commands disabled", NULL_PARG);
367
}
368
369
/*
370
* Add an environment variable table.
371
*/
372
static void
373
add_var_table(tlist, buf, len)
374
struct tablelist **tlist;
375
char *buf;
376
int len;
377
{
378
if (add_cmd_table(tlist, buf, len) < 0)
379
error("Warning: environment variables from lesskey file unavailable", NULL_PARG);
380
}
381
382
/*
383
* Search a single command table for the command string in cmd.
384
*/
385
static int
386
cmd_search(cmd, table, endtable, sp)
387
char *cmd;
388
char *table;
389
char *endtable;
390
char **sp;
391
{
392
register char *p;
393
register char *q;
394
register int a;
395
396
*sp = NULL;
397
for (p = table, q = cmd; p < endtable; p++, q++)
398
{
399
if (*p == *q)
400
{
401
/*
402
* Current characters match.
403
* If we're at the end of the string, we've found it.
404
* Return the action code, which is the character
405
* after the null at the end of the string
406
* in the command table.
407
*/
408
if (*p == '\0')
409
{
410
a = *++p & 0377;
411
while (a == A_SKIP)
412
a = *++p & 0377;
413
if (a == A_END_LIST)
414
{
415
/*
416
* We get here only if the original
417
* cmd string passed in was empty ("").
418
* I don't think that can happen,
419
* but just in case ...
420
*/
421
return (A_UINVALID);
422
}
423
/*
424
* Check for an "extra" string.
425
*/
426
if (a & A_EXTRA)
427
{
428
*sp = ++p;
429
a &= ~A_EXTRA;
430
}
431
return (a);
432
}
433
} else if (*q == '\0')
434
{
435
/*
436
* Hit the end of the user's command,
437
* but not the end of the string in the command table.
438
* The user's command is incomplete.
439
*/
440
return (A_PREFIX);
441
} else
442
{
443
/*
444
* Not a match.
445
* Skip ahead to the next command in the
446
* command table, and reset the pointer
447
* to the beginning of the user's command.
448
*/
449
if (*p == '\0' && p[1] == A_END_LIST)
450
{
451
/*
452
* A_END_LIST is a special marker that tells
453
* us to abort the cmd search.
454
*/
455
return (A_UINVALID);
456
}
457
while (*p++ != '\0')
458
continue;
459
while (*p == A_SKIP)
460
p++;
461
if (*p & A_EXTRA)
462
while (*++p != '\0')
463
continue;
464
q = cmd-1;
465
}
466
}
467
/*
468
* No match found in the entire command table.
469
*/
470
return (A_INVALID);
471
}
472
473
/*
474
* Decode a command character and return the associated action.
475
* The "extra" string, if any, is returned in sp.
476
*/
477
static int
478
cmd_decode(tlist, cmd, sp)
479
struct tablelist *tlist;
480
char *cmd;
481
char **sp;
482
{
483
register struct tablelist *t;
484
register int action = A_INVALID;
485
486
/*
487
* Search thru all the command tables.
488
* Stop when we find an action which is not A_INVALID.
489
*/
490
for (t = tlist; t != NULL; t = t->t_next)
491
{
492
action = cmd_search(cmd, t->t_start, t->t_end, sp);
493
if (action != A_INVALID)
494
break;
495
}
496
if (action == A_UINVALID)
497
action = A_INVALID;
498
return (action);
499
}
500
501
/*
502
* Decode a command from the cmdtables list.
503
*/
504
public int
505
fcmd_decode(cmd, sp)
506
char *cmd;
507
char **sp;
508
{
509
return (cmd_decode(list_fcmd_tables, cmd, sp));
510
}
511
512
/*
513
* Decode a command from the edittables list.
514
*/
515
public int
516
ecmd_decode(cmd, sp)
517
char *cmd;
518
char **sp;
519
{
520
return (cmd_decode(list_ecmd_tables, cmd, sp));
521
}
522
523
/*
524
* Get the value of an environment variable.
525
* Looks first in the lesskey file, then in the real environment.
526
*/
527
public char *
528
lgetenv(var)
529
char *var;
530
{
531
int a;
532
char *s;
533
534
a = cmd_decode(list_var_tables, var, &s);
535
if (a == EV_OK)
536
return (s);
537
s = getenv(var);
538
if (s != NULL && *s != '\0')
539
return (s);
540
a = cmd_decode(list_sysvar_tables, var, &s);
541
if (a == EV_OK)
542
return (s);
543
return (NULL);
544
}
545
546
#if USERFILE
547
/*
548
* Get an "integer" from a lesskey file.
549
* Integers are stored in a funny format:
550
* two bytes, low order first, in radix KRADIX.
551
*/
552
static int
553
gint(sp)
554
char **sp;
555
{
556
int n;
557
558
n = *(*sp)++;
559
n += *(*sp)++ * KRADIX;
560
return (n);
561
}
562
563
/*
564
* Process an old (pre-v241) lesskey file.
565
*/
566
static int
567
old_lesskey(buf, len)
568
char *buf;
569
int len;
570
{
571
/*
572
* Old-style lesskey file.
573
* The file must end with either
574
* ...,cmd,0,action
575
* or ...,cmd,0,action|A_EXTRA,string,0
576
* So the last byte or the second to last byte must be zero.
577
*/
578
if (buf[len-1] != '\0' && buf[len-2] != '\0')
579
return (-1);
580
add_fcmd_table(buf, len);
581
return (0);
582
}
583
584
/*
585
* Process a new (post-v241) lesskey file.
586
*/
587
static int
588
new_lesskey(buf, len, sysvar)
589
char *buf;
590
int len;
591
int sysvar;
592
{
593
char *p;
594
register int c;
595
register int n;
596
597
/*
598
* New-style lesskey file.
599
* Extract the pieces.
600
*/
601
if (buf[len-3] != C0_END_LESSKEY_MAGIC ||
602
buf[len-2] != C1_END_LESSKEY_MAGIC ||
603
buf[len-1] != C2_END_LESSKEY_MAGIC)
604
return (-1);
605
p = buf + 4;
606
for (;;)
607
{
608
c = *p++;
609
switch (c)
610
{
611
case CMD_SECTION:
612
n = gint(&p);
613
add_fcmd_table(p, n);
614
p += n;
615
break;
616
case EDIT_SECTION:
617
n = gint(&p);
618
add_ecmd_table(p, n);
619
p += n;
620
break;
621
case VAR_SECTION:
622
n = gint(&p);
623
add_var_table((sysvar) ?
624
&list_sysvar_tables : &list_var_tables, p, n);
625
p += n;
626
break;
627
case END_SECTION:
628
return (0);
629
default:
630
/*
631
* Unrecognized section type.
632
*/
633
return (-1);
634
}
635
}
636
}
637
638
/*
639
* Set up a user command table, based on a "lesskey" file.
640
*/
641
public int
642
lesskey(filename, sysvar)
643
char *filename;
644
int sysvar;
645
{
646
register char *buf;
647
register POSITION len;
648
register long n;
649
register int f;
650
651
if (secure)
652
return (1);
653
/*
654
* Try to open the lesskey file.
655
*/
656
filename = shell_unquote(filename);
657
f = open(filename, OPEN_READ);
658
free(filename);
659
if (f < 0)
660
return (1);
661
662
/*
663
* Read the file into a buffer.
664
* We first figure out the size of the file and allocate space for it.
665
* {{ Minimal error checking is done here.
666
* A garbage .less file will produce strange results.
667
* To avoid a large amount of error checking code here, we
668
* rely on the lesskey program to generate a good .less file. }}
669
*/
670
len = filesize(f);
671
if (len == NULL_POSITION || len < 3)
672
{
673
/*
674
* Bad file (valid file must have at least 3 chars).
675
*/
676
close(f);
677
return (-1);
678
}
679
if ((buf = (char *) calloc((int)len, sizeof(char))) == NULL)
680
{
681
close(f);
682
return (-1);
683
}
684
if (lseek(f, (off_t)0, 0) == BAD_LSEEK)
685
{
686
free(buf);
687
close(f);
688
return (-1);
689
}
690
n = read(f, buf, (unsigned int) len);
691
close(f);
692
if (n != len)
693
{
694
free(buf);
695
return (-1);
696
}
697
698
/*
699
* Figure out if this is an old-style (before version 241)
700
* or new-style lesskey file format.
701
*/
702
if (buf[0] != C0_LESSKEY_MAGIC || buf[1] != C1_LESSKEY_MAGIC ||
703
buf[2] != C2_LESSKEY_MAGIC || buf[3] != C3_LESSKEY_MAGIC)
704
return (old_lesskey(buf, (int)len));
705
return (new_lesskey(buf, (int)len, sysvar));
706
}
707
708
/*
709
* Add the standard lesskey file "$HOME/.less"
710
*/
711
public void
712
add_hometable(envname, def_filename, sysvar)
713
char *envname;
714
char *def_filename;
715
int sysvar;
716
{
717
char *filename;
718
PARG parg;
719
720
if (envname != NULL && (filename = lgetenv(envname)) != NULL)
721
filename = save(filename);
722
else if (sysvar)
723
filename = save(def_filename);
724
else
725
filename = homefile(def_filename);
726
if (filename == NULL)
727
return;
728
if (lesskey(filename, sysvar) < 0)
729
{
730
parg.p_string = filename;
731
error("Cannot use lesskey file \"%s\"", &parg);
732
}
733
free(filename);
734
}
735
#endif
736
737
/*
738
* See if a char is a special line-editing command.
739
*/
740
public int
741
editchar(c, flags)
742
int c;
743
int flags;
744
{
745
int action;
746
int nch;
747
char *s;
748
char usercmd[MAX_CMDLEN+1];
749
750
/*
751
* An editing character could actually be a sequence of characters;
752
* for example, an escape sequence sent by pressing the uparrow key.
753
* To match the editing string, we use the command decoder
754
* but give it the edit-commands command table
755
* This table is constructed to match the user's keyboard.
756
*/
757
if (c == erase_char)
758
return (EC_BACKSPACE);
759
if (c == kill_char)
760
return (EC_LINEKILL);
761
762
/*
763
* Collect characters in a buffer.
764
* Start with the one we have, and get more if we need them.
765
*/
766
nch = 0;
767
do {
768
if (nch > 0)
769
c = getcc();
770
usercmd[nch] = c;
771
usercmd[nch+1] = '\0';
772
nch++;
773
action = ecmd_decode(usercmd, &s);
774
} while (action == A_PREFIX);
775
776
if (flags & EC_NORIGHTLEFT)
777
{
778
switch (action)
779
{
780
case EC_RIGHT:
781
case EC_LEFT:
782
action = A_INVALID;
783
break;
784
}
785
}
786
#if CMD_HISTORY
787
if (flags & EC_NOHISTORY)
788
{
789
/*
790
* The caller says there is no history list.
791
* Reject any history-manipulation action.
792
*/
793
switch (action)
794
{
795
case EC_UP:
796
case EC_DOWN:
797
action = A_INVALID;
798
break;
799
}
800
}
801
#endif
802
#if TAB_COMPLETE_FILENAME
803
if (flags & EC_NOCOMPLETE)
804
{
805
/*
806
* The caller says we don't want any filename completion cmds.
807
* Reject them.
808
*/
809
switch (action)
810
{
811
case EC_F_COMPLETE:
812
case EC_B_COMPLETE:
813
case EC_EXPAND:
814
action = A_INVALID;
815
break;
816
}
817
}
818
#endif
819
if ((flags & EC_PEEK) || action == A_INVALID)
820
{
821
/*
822
* We're just peeking, or we didn't understand the command.
823
* Unget all the characters we read in the loop above.
824
* This does NOT include the original character that was
825
* passed in as a parameter.
826
*/
827
while (nch > 1)
828
{
829
ungetcc(usercmd[--nch]);
830
}
831
} else
832
{
833
if (s != NULL)
834
ungetsc(s);
835
}
836
return action;
837
}
838
Loggerhead is a web-based interface for Breezy
Version: 2.0.1